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Date: Fri, 05 Mar 1999 17:14:50 -0500
From: jim altieri
Subject: music
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hey csound people,
i have a couple of my csound pieces up on mp3.com. if you'd like, you can
check them out at http://www.mp3.com/tweeg/
if you have admiration, comments, or insults, i'd really like to hear
them. let me know.
-jim altieri
________________________________________________
join the effort.
http://www.distributed.net
jim.altieri@oberlin.edu
http://www.oberlin.edu/~jaltieri
ocmr 76
oberlin, oh 44074
(440) 775-6243
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From: David Boothe
To: 'Andre Bartetzki' ,
Csound Mailing List
Subject: RE: bugs in wg opcodes
Date: Fri, 5 Mar 1999 18:20:49 -0600
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See below for more clarifications. Hope these help.
-David.
> 1. ar wgpluck2 iplk,xam,icps,kpick,krefl
>
> A krefl value of 1 means no reflection at all and 0 is total
> reflection
> (therefore this is an absorption coefficient). The manual
> says the opposite.
> (there was recently a short thread on this problem)
Yes this does work opposite. The documentation will change to reflect this
situation.
> -----------
> 3. ar wgbrass kamp,kfreq,iatt,kvibf,kvamp,ifn [,iminfreq]
>
> This line (similar to the manual example)
>
>
> error: insufficient required arguments, line 3:
> a1 wgbrass 20000, 440, 0.1, 6.1, 0.05, 1
> 1 syntax errors in orchestra. compilation invalid
>
>
> Does that mean that there is an undocumented argument before
> ifn, for example
> an idetk-time similar to the other wg opcodes?
Yes. Syntax should read:
ar wgbrass kamp,kfreq,ktens,iatt,kvibf,kvamp,ifn [,iminfreq]
ktens represents lip tension.
> 5. ar shaker kamp,kfreq,kbeans,kdamp,knum,ktimes [,idecay]
> BTW, what does a frequency of a shaker really mean??
>
Frequency is the resonant frequency of the shaker's gourd.
And in case someone missed my previous post, syntax should be:
ar shaker kamp,kfreq,kbeans,kdamp,ktimes [,idecay]
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RE: bugs in wg opcodes
See below for more clarifications. Hope these help.
-David.
> 1. ar wgpluck2 iplk,xam,icps,kpick,krefl
>
> A krefl value of 1 means no reflection at all and 0 is total
> reflection
> (therefore this is an absorption coefficient). The manual
> says the opposite.
> (there was recently a short thread on this problem)
Yes this does work opposite. The documentation will change to reflect this situation.
> -----------
> 3. ar wgbrass kamp,kfreq,iatt,kvibf,kvamp,ifn [,iminfreq]
>
> This line (similar to the manual example)
>
>
> error: insufficient required arguments, line 3:
> a1 wgbrass 20000, 440, 0.1, 6.1, 0.05, 1
> 1 syntax errors in orchestra. compilation invalid
>
>
> Does that mean that there is an undocumented argument before
> ifn, for example
> an idetk-time similar to the other wg opcodes?
Yes. Syntax should read:
ar wgbrass kamp,kfreq,ktens,iatt,kvibf,kvamp,ifn [,iminfreq]
ktens represents lip tension.
> 5. ar shaker kamp,kfreq,kbeans,kdamp,knum,ktimes [,idecay]
> BTW, what does a frequency of a shaker really mean??
>
Frequency is the resonant frequency of the shaker's gourd.
And in case someone missed my previous post, syntax should be:
ar shaker kamp,kfreq,kbeans,kdamp,ktimes [,idecay]
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Date: Thu, 04 Mar 1999 04:10:25 +0000
From: Larry Troxler
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To: Wayne Freno
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Subject: Re: Grains from Audio files
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Wayne Freno wrote:
>
> What are the best sources (hopefully free and on the
> internet! ;-)) for using audio files in granular
> synthesis? So far I can only get the grain opcode
> to use a sine wave, but I can imagine mucho pontential
> with audio files! Thanks!
>
> Wayne Freno
Don't know of what internet sources there are, but you're really missing
out by not experimenting with natural audio as the source. Also, I
haven't been using csound lately, so I don't know what the opcode
parameter are, but a nice start is to take a sound file and do the
following with the grain stuff:
- set the playback speed for the individual grains to be either the same
as the original sample, or lower (most likely) or higher, depending on
what frequency spectrum you want the result to have
- set the parameters so that the granulated output will slowly traverse
the source file, but much slower than the original sample's playback
rate. (time expansion, basically)
- set the parameters so that the grain density is fairly high. By
density I mean how many grains, on average, are playing at any given
point in time. What I mean is you want overlap. Maybe 5 to 20 for
starters?
- Randomize the times a bit, either in at which point in the source file
successive grains are taken from, or in at what point in the output file
the grains are started.
The result of this is you'll get a time-stretched version of the
original file, but because of the grain density and built in randomness
(jiterryness?), it can sound much richer than the source. The perception
is one of slowly experiencing every nuance of the timbre changes of the
sound. I did this once with a cheap soundcard recording of a bicycle
bell, and the initial "clack" became a complex unpitched sound, and the
ringing of the bell turned into a delightfull, 10 or 20 second evolution
of timbre as the bell decayed.
I know this is a bit sketchy and maybe not self-explanatory. Hopefully
some one who knows the grain opcode will chime in.
Larry
-- Larry Troxler -- lt@westnet.com -- Patterson, NY USA --
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